I would go back further, namely why HBD was created in the first place?
Now, that is an interesting point. HBD (or SBD) has been around since the very beginning and the Steem whitepaper reasons it quite understandable, at least to me.
Put simpy, it is there (or it is meant to be there) to provide stability to the system. And it was also intended as a commonly used currency with predictable value (in fiat), even though it is not technically a stablecoin. Imagine I book a hotel for this summer and would opt for crypto payment. The hotel will likely have prices in fiat, as it pays its stuff and basically everything in fiat. So my stay would cost say $300. If I prepaid it today, it will cost 1.000 Hive. If I preferred paying upon my arrival, it could cost anything from let's say 200 to 2.000. I wouldn't like this uncertainty. Some people might, I am just not that kind of person :) On the other hand, I'd feel bad about paying 1.000 Hive today and then realizing I could have paid way less if I'd opted for payment in the summer.
HBD should solve that, and when we have reversed conversions (so that you can convert both HBD=>Hive and Hive=>HBD - something that does not exist on Steem, where SBD actually hoover way above dollar), I guees we could manage keep the price stable even without HBD Stabilizer. If the price drops, you can buy cheap HBD for less than a dollar and then convert it for Hive worth one dollar. When the price rises, you can sell it for Hive and then convert the earned Hive back, taking profit again.
We've already discussed that a lot, I just appreciated your thought and couldn't help replying :))